USA, Canada
UK, Australia, Ireland, New Zeland
Japan, India, China, South Africa
Spain, Italy, Netherlands, Switzerland
Inside-Diameter & Cercumferene(mm)
3
F
4
4.25
14.05 & 44.14
3.25
F.5
-
4.75
14.24 & 44.74
3.50
G
5
5.5
14.45 & 45.40
3.75
G.5
6
6
4.65 & 46.02
4
H
7
6.75
14.88 & 46.80
4.25
H.5
-
7.5
15.09 & 47.40
4.50
I
8
8
15.29 & 48.00
4.75
J
-
8.75
15.49 & 48.70
5
J 1/2
9
9.25
15.70 & 49.30
5.25
K
-
10
15.90 & 50.00
5.50
K 1/2
10
10.5
16.10 & 50.60
5.75
L
-
11.25
16.31 & 51.20
6
L 1/2
11
11.75
16.51 & 51.90
6.25
M
12
12.5
16.71 & 52.50
6.50
M 1/2
13
13.25
16.92 & 53.10
6.75
N
-
13.75
17.12 & 53.80
7
N 1/2
14
14.5
17.32 & 54.40
7.25
O
-
15
17.53 & 55.10
7.50
O 1/2
15
15.75
17.73 & 55.70
7.75
P
-
16.25
17.93 & 56.30
8.0
P 1/2
16
17
18.14 & 57.00
8.25
Q
-
17.5
18.34 & 57.60
8.50
Q 1/2
17
18.25
18.54 & 58.30
8.75
R
-
19
18.75 & 58.90
9
R 1/2
18
19.5
18.95 & 59.50
9.25
S
-
20.25
19.15 & 60.20
9.50
S 1/2
19
20.75
19.35 & 60.80
9.75
T
-
21.5
19.56 & 61.40
10
T 1/2
20
22
19.76 & 62.10
10.25
U
21
22.75
19.96 & 62.70
10.50
U 1/2
22
23.25
20.17 & 63.40
10.75
V
-
24
20.37 & 64.00
11
V 1/2
23
24.75
20.57 & 64.60
11.25
W
-
25.25
20.78 & 65.30
11.50
W 1/2
24
26
20.98 & 65.90
11.75
X
-
26.5
21.18 & 66.60
12
X 1/2
25
27.25
21.39 & 67.20
12.25
Y
-
27.75
21.59 & 67.80
12.50
Z
26
28.5
21.79 & 68.50
12.75
Z 1/2
-
29
22.00 & 69.10
13
-
27
29.75
22.20 & 69.70
13.25
Z1
-
30.5
22.40 & 70.40
13.50
-
-
31
22.61 & 71.00
13.75
Z2
-
31.75
22.81 & 71.70
14
Z3
-
32.25
23.01 & 72.30
14.25
-
-
33
23.22 & 72.90
14.50
Z4
-
33.5
23.42 & 73.60
14.75
-
-
34.25
23.62 & 74.20
15
-
-
34.75
24.23 & 76.10
